CVE-2026-111094: In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 remote code execution via a whitelist bypass in the

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HIGH 8.1REMOTEUPGRADE

CVE-2026-111094 is a high-severity flaw (CVSS 8.1) affecting teamcity. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 remote code execution via a whitelist bypass in the build messages protocol was possible

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-10-15
Last modified	2026-10-16

Publisher (CNA): JetBrains s.r.o. · Vendor: jetbrains

Last updated 2026-10-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-15 16:17 UTCPublished CVE record published
2026-10-16 19:19 UTCUpdated Record last modified

jetbrains teamcity UPGRADE

Affected: < 2025.11.8 · >= 2026.1 and < 2026.1.4

Fixed in: 2025.11.8, 2026.1.4

Safe to downgrade to: a release before 2026.1

1. Check installed version

apt-cache policy teamcity || rpm -q teamcity || teamcity --version

2. UPGRADE to 2025.11.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade teamcity

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade teamcity

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2026.1 (Debian / Ubuntu)

apt-cache madison teamcity sudo apt install teamcity=<VERSION_BEFORE_2026.1> sudo apt-mark hold teamcity

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list teamcity sudo dnf downgrade teamcity-<VERSION_BEFORE_2026.1> sudo dnf versionlock add teamcity

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-111094?

teamcity: upgrade to 2025.11.8, 2026.1.4. Exact commands for each OS are on this page.

Is CVE-2026-111094 being exploited?

CVE-2026-111094 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-111094 affect?

CVE-2026-111094 affects teamcity. Severity is high (CVSS 8.1). In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 remote code execution via a whitelist bypass in the build messages protocol was possible

How urgent is CVE-2026-111094?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Software pages

JetBrains TeamCity vulnerabilities

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References

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